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How to count TRUE values in a logical vector
...o it's kind of beta-release or something like that. I'll try to improve it by removing loops from code...
The main idea is to write a function that will take 2 (or 3) arguments. First one is a data.frame which holds the data gathered from questionnaire, and the second one is a numeric vector with c...
Git fails when pushing commit to github
... imageUploader: {
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Is it possible to use 'else' in a list comprehension? [duplicate]
...e significantly reduced computation time when dealing with large data sets by replacing list comprehensions (specifically nested ones) with for-loop/list-appending type structures you have above. In this application I doubt you will notice a difference.
...
java.lang.NoClassDefFoundError: Could not initialize class XXX
...und that this problem happens only when several threads run in one process(By the way, the linux machine has double cores and double processes). That means if there are two tasks(both uses the code which has static block or variables) run in the same process, it goes wrong, but if they run in differ...
How to use sed/grep to extract text between two words?
...een Here and String, non-greedy (or lazy). However, the type of regex used by sed does not support lazy quantifiers (a ? immediately after .*) according to this Stackoverflow question. Usually to implement a lazy quantifier you would just match against everything except the token you didn't want to ...
rake db:schema:load vs. migrations
...emed strange to me that Rails didn't have a 'sync and update' feature. ie, by using the schema file (which represents the entire, up-to-date schema), go through the existing DB structure and add/remove tables, columns, indexes as required.
To me this would be a lot more robust, even if possibly a l...
Difference between Activity Context and Application Context
...a practical example of what "non-standard back stack behaviors", mentioned by @CommonSenseCode, means:
Suppose that you have two apps that communicate with each other, App1 and App2.
Launch App2:MainActivity from launcher. Then from MainActivity launch App2:SecondaryActivity. There, either using a...
How do I convert a dictionary to a JSON String in C#?
...e to deal with bugs, and with the impossibility of getting a lite version. By the way, inside json libs, there are naive methods like this and no magic.
– Léon Pelletier
Jun 22 '13 at 18:02
...
Installing a local module using npm?
...
Since asked and answered by the same person, I'll add a npm link as an alternative.
from docs:
This is handy for installing your own stuff, so that you can work on it and test it iteratively without having to continually rebuild.
cd ~/projects...
How to determine a Python variable's type?
...usually a signed integer equal to the implementation's word width (limited by the system). It's usually implemented as a long in C. When integers get bigger than this, we usually convert them to Python longs (with unlimited precision, not to be confused with C longs).
For example, in a 32 bit Python...